package cfets.TCPIPSocket.common;

/**
 * Created by lyk on 2016/9/17.
 * Package name: cfets.TCPIPSocket.common
 * Porject name: untitled1
 */

/**
 * This program demonstrates a triangular array.
 * @version 1.20 2004-02-10
 * @author Cay Horstmann
 */
public class LotteryArray
{
    public static void main(String[] args)
    {
        final int NMAX = 10;

        // allocate triangular array
        int[][] odds = new int[NMAX + 1][];
        for (int n = 0; n <= NMAX; n++)
            odds[n] = new int[n + 1];

        // fill triangular array
        for (int n = 0; n < odds.length; n++)
            for (int k = 0; k < odds[n].length; k++)
            {
            /*
             * compute binomial coefficient n*(n-1)*(n-2)*...*(n-k+1)/(1*2*3*...*k)
             */
                int lotteryOdds = 1;
                for (int i = 1; i <= k; i++)
                    lotteryOdds = lotteryOdds * (n - i + 1) / i;

                odds[n][k] = lotteryOdds;
            }

        // print triangular array
        for (int[] row : odds)
        {
            for (int odd : row)
                System.out.printf("%4d", odd);
            System.out.println();
        }
    }
}
